Holographyforum.org / holowiki.org

Welcome to the forum Tomás. Almost certainly, the lasers do not have enough coherence. Have you previously made holograms with these lasers? You might want to try one of Dave's lasers (532nm) to get started with: https://holographyforum.org/forum/viewtopic.php?t=9912&start=70 Other than Dave's i...

Some random links you might already know about: https://wyomingelectronics.com/shop/newport-1916-c-laser-optical-power-meter/?srsltid=AfmBOoqRkEzbNjiL-DOwcUknVvAZJ8czalv6G2NONQKccb5IwZn5pwk6 https://www.ebay.com/itm/266361570448 The Wyoming Electronics site says they start at $495 (?) and the eBay r...

The clamps hold the film down as well as pull it laterally. It's actually flatter than if I had used a glass carrier It's not the flatness that matters, it's the micro-stability of the plastic film. The thermal expansion/contraction of plastic is quite high, and if there is some kind of pulling for...

I am using a 4x5 negative carrier that has a clamping system to secure the film, so no glass is holding the film. This could easily be the source of the problem. I don't think film that isn't supported on glass will work for holograms. I haven't used PFG-01 film (don't know what the plastic film ma...

However... When assessing color, one has to differentiate between "unrelated color", i.e., a color partch without any surroundings, and "related color", i.e., a color in image. Color perception changes a lot when looking at images -- although colorimetrically there may be no roy...

Thanks, Petr, the analysis is much appreciated. I noticed variations in the reproduction of the CIE diagram before, but didn't realize how much they varied until you pointed out how inaccurate that one was. The simulation you posted (the second diagram) looks like what I've experienced so far with 4...

Assuming you're recording DCG, it could depend on how you process. Display DCG always shifted to a lower wavelength due to differential swelling, so the 488 might have shifted down to a lower band; sky blue seems to be about 480. Yes. That's true, I've seen a lot of variation in the final hologram ...

One very practical difference is luminous efficacy of those wavelengths, i.e., how bright they look like. If we set luminous efficacy of 555 nm as 100%, then luminous efficacies of 610, 640 and 660 nm are 50%, 17% and 6%. In short, a bright red object would appear much dimmer with 660 nm than with ...

Haven't used it, but at least they say it's good for holography: https://www.cnilaser.com/PDF/MDL-C-660.pdf 120mW is quite good. I wonder what the practical difference is between 640 and 660nm for color holography. According to Kaveh's paper (which is the one that makes most sense to me), the ideal ...

Thanks Din and Joy. That's interesting. The nearest equivalent at 640nm, as far as I know, is the 300mW Cobolt Bolero, which is over $20,000. The problem with these expensive lasers is that, after the warranty expires (maybe 2 years at most), any customer support would be an open question. I'm not w...